Improvement in oiroulae-saw tables



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LettersPatent No. 76,947, dated April 21, 1868.'

IMPROVEMENT IN UIRGULAR-SAW TABLES.

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Be it known that I, GEORGE II.SANBORN, of the city of Boston, in the State of Massachusetts, have invented certain new and useful Improvements in Bookbinders Sewing-Machines; and I do hereby declare the following to be a full and correct description of. the same, referencel being had tothe accompanying drawings, in whicb Figure 1 is a perspective view of the machine, the -tablc being shown in its elevated position. in order to display the parts beneath it.

Figure 2 is a detail view of a portion of the gauge. Figure 3 is a similar view, showing the mode of attachment of the slats which separate the saw-blades. The same letter indicates the samepart wherevenit occurs. l This invention relates to that class of machines used by bookbinders for sawing the grooves for holding the threads,`and those for the catch or kettle-stitch. i i I I My improvements consist in a new mode of attaching and counterpoising the table, so that it can be morev conveniently `raised and lowered; in a more secure method of' attaching the slats to the table; and in the coni hination with thc table of an adjustable gauge, all as hereinafter set forth. i l To enable -otbers to make and use my improved sawing-machine, I will proceed to describe its construction and operation. v Y v In the drawings,'A marks an iron frame by which the operative parts ofthe machine are supported. B is a large frictionpulley,turned by'means of handle C, and hearingagainst band I), travellingover pulleys E and F, the latter of which is on the end of the saw-shaft 'This driving-mechanism may be varied -at pleasure. On the lshaft G are placed a number ot' saws S S, separated fromieachother by sleeves H, placed on the saw'- shaft, the distance of the saws from each other depending on the length of the sleeves, which may be varied according to the requirements of the work to be done. The peripheryofy the saws projects above'the surface of the table T, through an opening, J, in the table. The saw-shaft is held in an adjustable fra-me, X, which can be raised and loweredby set-screws, or in any suitable manner, to regulate the projection of the saws above the surface ofthe table. The table T is hinged to the frame at 7i, and may either lie in a horizontal position on the frame, or be raised to a vertical or any intermediateposition, as maybe desired. The table is usually made of iron, and is quite heavy, and to facilitate the handling of it, I attach to it, by cords R, passing over pulleys l?, a counter-poise, W, of sniicient weight to relieve the movement of the table on its hinges of all difficulty.

y The inaladjustment of the position of the table, when nearly down in contact with the frame, is made by wedges w, slidingl in the trough V, Operated by a screw, and working against the inclined faces/ot similar wedges oppositein position, attached to the under side of the table. Lugs U,passing inside the frame, and in contact with it when the table approaches its lowest position, tend to prevent any lateral movement of the'table when down. The opening Jin the table, through which the saws project, receives any number of slats K that may be required to till the spaces between the saws, and preserve the continuity of the surface-ot' the table, except as regards the slits inwhich thesaws work. It is desirable that these slats should be easily inserted and removed, and yet be firmly and securely held when in place. Their construction mode of attachment are clearly shown in iig. 3. They have a bevel, c, at one end, corresponding with a groove of similar shape in they table, and a groove, d, inthe Opposite end, which receives the edge of bar L, which 'works in a recess in the table made to receive it, and is forced intoV the groove cl, by a spring or springs, s, of any convenient form or material.` By pressing back the bar L, the slats are readily released or inserted, and, when in place, they are securely held.

To the top of the table I attach a gauge, M, by means of the parallel bars N, to which the gauge is pivotedv atp p. The barsN are pivotcd atpji to lugs projecting from the edge of the table. A curved slot, a, receives a screw which projects up through it from the bar N, and takes a clamping-nut, whicl at any required position. i

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is-

The spring-bar I,`.in combination with the grooved slats K, arranged and operating as described.

The above specification of mysaid invention signed and witnessed al? BOSOH, this 17th day 0f October,

GEO. -l-I. SANBORN,

' Witnesses:

WILLIAM C. CLEVELAND, Oms. F. SrANsnnnr.

1 serves to clampthe gauge 

